#include <iostream>
#include <string>

using namespace std;


int main()
{
    string s1;
    cout << "size:" << s1.size()  << endl;
    
    cout << "length:" << s1.length() << endl;

    //string是通过写时拷贝实现的，string对象总共占4/8个字节;
    cout << "sizeof(string):" << sizeof(string) <<endl;

    cout << "hello vim" << endl;

    return 0;
}
